Commentaire de Pyregelys

For this achievement you cannot let any Goule reach Devlynn Styx during the concert. It can be pretty difficult to do it yourself, so a group of at least five people is recommended.

You can find the concert Cauldron of Rock inside the cave at:/way 64.40, 67.85It starts every hour on half the hour. Jay Maguire will announce how much time there is left every ten minutes or so:

Jay Maguire yells: If you're interested in gettin' down, the Blight Boar concert starts in twenty!Jay Maguire yells: Blight Boar is playing their underground show on the east side of the island! Your headliner Blight Boar goes on in ten minutes!Jay Maguire yells: One minute till Blight Boar takes the stage! Join us in the Cauldron of Rock on the east side of the island.